The contents of twelve capsules from the crossed flowers on the crossed
plants, and of twelve capsules from self-fertilised flowers on the
self-fertilised plants, were placed in separate watch-glasses for
comparison; and the crossed seeds seemed more numerous by half than the
self-fertilised.
The plants on both sides of Pot 1, after they had seeded, were cut down
and transplanted into a large pot with plenty of good earth, and on the
following spring, when they had grown to a height of between 5 and 6
inches, the two lots were equal, as occurred in a similar experiment in
the last generation. But after some weeks the crossed plants exceeded
the self-fertilised ones on the opposite side of the same pot, though
not nearly to so great a degree as before, when they were subjected to
very severe competition.
CROSSED AND SELF-FERTILISED PLANTS OF THE THIRD GENERATION.
Crossed seeds from the crossed plants, and self-fertilised seeds from
the self-fertilised plants of the last generation, were sown thickly on
opposite sides of a small pot, Number 1. The two tallest plants on each
side were measured after they had flowered, and the two crossed ones
were 12 and 7 1/2 inches, and the two self-fertilised ones 8 and 5 1/2
inches in height; that is, in the ratio of 100 to 69. Twenty flowers on
the crossed plants were again crossed and produced twenty capsules; ten
of which contained 1.
Pages:
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113